Pulsation dampeners and relief valves
PCT supplies Griffco pulsation dampeners, pressure relief valves and back pressure valves that smooth the pulsing flow from diaphragm, piston and plunger pumps, protect piping and instruments, and keep metering systems accurate, in alloy, non metallic and sanitary designs.
Last updated October 2026
Who makes the dampeners and valves PCT supplies?
PCT supplies Griffco, a US manufacturer of pulsation dampeners, pressure relief valves and back pressure valves. Griffco builds standard units to 1,250 PSIG design pressure and custom units for higher pressures.
What does a pulsation dampener do?
A pulsation dampener absorbs the pressure spikes created each time a reciprocating pump strokes. A gas charged bladder or diaphragm takes up the surge, so flow downstream is smoother, pipes vibrate less and gauges and flow meters read correctly.
Dampeners are available in PVC, 316 stainless steel, Alloy 20, Hastelloy C and other materials to match the chemical. Griffco also makes a patented Fusion Dampener that combines a back pressure valve and a pulsation dampener in one unit, and AOD dampeners sized for air operated diaphragm pumps (see AOD pulsation dampeners).
Which dampener and valve types are available?
Griffco offers fixed, adjustable, automatic and chargeable dampener designs, plus valves that protect the pump and steady the discharge pressure.
| Product | What it does |
|---|---|
| Alloy and non metallic pulsation dampeners | Smooth discharge flow from diaphragm, piston and plunger pumps |
| Adjustable, automatic and chargeable dampeners | Match the charge pressure to the system as conditions change |
| Sanitary CIP Series dampeners | 30 Ra surface finish with EPDM and silicone bladders for food and pharmaceutical lines |
| Pressure relief valves | Protect the pump and piping from over pressure |
| Back pressure valves | Hold a steady discharge pressure so metering pumps dose accurately |
Frequently asked questions
What pressure can a Griffco dampener handle?
Standard Griffco dampeners are designed to 1,250 PSIG, and custom units are available for higher pressures.
Where should a pulsation dampener be installed?
As close to the pump discharge as practical, before any long runs of pipe or instruments. Our installation guide shows typical layouts.
What is a back pressure valve for?
It holds a minimum pressure on the pump discharge so a metering pump does not siphon or overfeed when the system pressure is low.
Are sanitary dampeners available?
Yes. Griffco CIP Series dampeners have a 30 Ra surface finish with EPDM and silicone bladder options.
Tell us what you are moving
Send the fluid, flow, temperature and pressure. The PCT team will match the equipment and send a complimentary quote.